KR20170116754A - High pressure centrifugal impeller - Google Patents

Abstract

The present invention relates to a fixed-pressure centrifugal impeller, in which the feathers formed on the main plate are formed such that the feathers are oriented from the inside toward the outside in the rotational direction with respect to the center line of the main plate, and the feathers are formed in a bent shape in the rotational direction, It is possible to improve the durability of the impeller because the surging phenomenon does not occur in the low air volume region, and the structure of the impeller is strong, the number of the feather is small, and the driving motor is directly connected The present invention relates to a fixed-pressure centrifugal impeller capable of reducing the cost and time required for manufacturing a blower.

Description

{High pressure centrifugal impeller}

The present invention relates to a fixed-pressure centrifugal impeller, in which the feathers formed on the main plate are formed such that the feathers are oriented from the inside toward the outside in the rotational direction with respect to the center line of the main plate, and the feathers are formed in a bent shape in the rotational direction, The present invention relates to a fixed-pressure centrifugal impeller capable of improving the durability of an impeller because surging is not generated in a low airflow region.

The impeller is a main part of a pump, blower or compressor. The impeller is rotated with several fulcrums arranged at the same interval on the circumference. The impeller is connected to the drive motor and connected to the impeller. (Hereinafter referred to as a fluid) flows out.

In general, the impeller feather is divided into a centrifugal type and an axial flow type, and a centrifugal pulsator flows fluid perpendicular to the rotating shaft, and the axial flow pulp causes fluid to flow in the direction of the rotating shaft.

Here, as shown in FIG. 1, the centrifugal impeller 10 is an impeller in which a pressure is generated while a fluid is transported in the radial direction of the impeller, and the characteristics of the impeller are changed according to the shape of the impeller feather. Generally, the most widely used centrifugal blowers are roughly divided into a backward blower, a radial blower, and a multi-purpose blower.

The impeller of the backward blower is a blower consisting of a centrifugal impeller with the impeller feather backwardly tilted in the direction of rotation and having a convex surface with respect to the direction of rotation,

The impeller of the radial type blower is a blower composed of a centrifugal impeller having a radial feather, and the shape of the feather is a straight plate type. (D)

The impeller of a multistage blower is a blower consisting of a centrifugal impeller having a wide width, a feather passage length, and a forwardly inclined vane with respect to the direction of rotation, which is also called a sirocco blower. The shape of the impeller blade of the multistage blower has a concave surface with respect to the rotational direction. (E)

In addition, the impeller of the airfoil blower is composed of a centrifugal impeller having an airfoil whose blade cross-section has a wing shape (b2). Limit-rod type centrifugal impellers are also rarely used, which limit the maximum working load when driving an impeller. (B1) Some impellers have another type of inverted all-round feather, but they are rarely used because they have no special advantages c).

(A), (b1) and (b2)), a right angle (d) and a total turning angle (c and e) have.

Among these, the radial blower (d) is low in efficiency but strong in structural strength and is mainly used for powder transportation such as coal powder and is not used as a ventilation and air conditioning machine. Also, limit rod type centrifugal impellers are rarely used (b1) as described above, and there are other types of impellers, but they are rarely used because there is no particular advantage.

As described above, the blower used for air conditioning is mainly composed of centrifugal impellers (a) and (b2) having feathers of a backward curve and a centrifugal impeller (e) having feathers of all forward curves.

However, the centrifugal impellers (a) and (b2) having the feather of the backward horn have smaller air velocity due to the small amount of air generated compared to the generated pressure. The centrifugal impellers ((a) and (b2)) having the feather of the backward horn have advantages of high efficiency and high rotation speed of the impeller, so that they are directly connected to the driving motor. Therefore, the centrifugal impellers ((a) and (b2)) having the feathers of the backward horn are used frequently when the air volume is small, and are difficult to use when a large amount of air is required.

On the other hand, the centrifugal impeller (e) with the all-round convergent impeller has a high non-velocity due to the large amount of air generated compared to the generated pressure. Since the efficiency is low and the number of revolutions of the impeller is small, The structure is complicated, power transmission efficiency is low, and surging phenomenon occurs in a low air volume region. Here, the surging phenomenon may cause the impeller to vibrate, resulting in the impeller feather and the rotating shaft being damaged. In addition, the centrifugal impeller (e) having the all-rounded feathers has a drawback that the number of feathers is very large and the ratio of the inner diameter to the outer diameter of the impeller is so large that the structure is weak and the efficiency is low.

KR 20-0241247 Y1 (July 24, 2001)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an impeller for a wind turbine, And to provide a fixed-pressure centrifugal impeller capable of improving the durability of the impeller.

The present invention also provides a fixed-pressure centrifugal impeller capable of reducing the cost and time required for manufacturing a blower because the structure of the impeller is strong, the number of feathers is small, and it can be directly connected to the driving motor.

In order to achieve the above object, a fixed pressure centrifugal impeller (1000) of the present invention comprises: a main plate (200) rotated around a rotational axis (100); And a plurality of vanes (300) formed on an inner circumference of the main plate (200) and spaced apart in the circumferential direction; The collar 300 is formed by inclining toward the rotational direction of the main plate 200 with respect to a center line L passing through the center of the main plate 200, Is formed in a curved shape in the same direction as the rotating direction and the appended angle? Is set with respect to the tangent line L3 with the inner diameter Di at the inner end portion A of the collar so that the outer end portion B of the collar is determined And the attachment angle [theta] is in a range of 0 [deg.] To 90 [deg.].

The collar 300 also forms a vertical bisector L2 of a straight line L1 connecting the inner end A and the outer end B and forms a circular arc L2 on the vertical bisector L2, Shaped curve that connects the inner end A and the outer end B with respect to the center point (point C) of the feather by selecting a center point (point C) of the feather determining the feather .

The radius R of the vanes 300 becomes smaller as the position of the center point C of the vanes 300 approaches the straight line L1 and as the distance from the straight line L1 increases, The radius R of the blade 300 is increased and the length of the arc of the blade 300 is adjusted according to the radius R. [

In addition, the vest 300 has a tangent to the vest 300 at the inner end portion A and a tangent to the inner end portion A (A) according to the size of the attachment angle? The size of the entrance pupil 1 which is the angle formed by the tangent L3 with respect to the inner diameter Di is adjusted in accordance with the position of the center point C of the collar, The size of the exit pupil? 2, which is the angle formed by the tangent to the collar 300 at the end B and the tangent L4 relative to the outer diameter Do at the outer end B, is adjusted.

In addition, the main plate 200 includes an inner diameter main plate 210 to which an inner end A of the vane 300 is connected; An outer diameter main plate 220 to which an outer end portion B of the vane 300 is connected; And a control unit.

The fixed-pressure centrifugal impeller of the present invention has an advantage in that the performance of the fixed-pressure centrifugal impeller is increased due to an increase in the wind amount and the wind pressure compared to the conventional impellers, and the surging phenomenon does not occur in the low air volume region, thereby improving the durability of the impeller .

In addition, since the impeller can be directly connected to the driving motor, the structure of the power transmitting device can be simplified.

In addition, since the structure of the impeller is strong, the number of feathers is small, and the driving motor can be directly connected to the motor, the cost and time required for manufacturing the blower can be reduced.

1 is a schematic view of a conventional centrifugal impeller;
2 is a schematic view of a fixed pressure centrifugal impeller according to one embodiment of the present invention.
3 is a partial enlarged view of Fig.
4 is a graph illustrating performance and efficiency of a fixed-pressure centrifugal impeller according to an embodiment of the present invention.

Hereinafter, the fixed pressure centrifugal impeller of the present invention as described above will be described in detail with reference to the accompanying drawings.

[Example 1]

FIG. 2 is a schematic view showing a fixed-pressure centrifugal impeller according to an embodiment of the present invention, and FIG. 3 is a partially enlarged view of FIG.

As shown in the figure, the fixed-pressure centrifugal impeller 1000 of the present invention includes a main plate 200 rotated around a rotation axis 100; And a plurality of vanes (300) formed on an inner circumference of the main plate (200) and spaced apart in the circumferential direction; The collar 300 is formed by inclining toward the rotational direction of the main plate 200 with respect to a center line L passing through the center of the main plate 200, Is formed in a curved shape in the same direction as the rotating direction and the appended angle? Is set with respect to the tangent line L3 with the inner diameter Di at the inner end portion A of the collar so that the outer end portion B of the collar is determined , And the attachment angle ([theta]) may be formed in the range of 0 [deg.] To 90 [deg.].

First, the fixed pressure centrifugal impeller 1000 of the present invention comprises a main plate 200 and a plurality of vanes 300.

The main plate 200 may be formed as a circular plate and may be formed such that the main plate 200 is rotated about the rotation axis 100 by fixing the rotation axis 100 at the center of the one surface. At this time, the rotary shaft 100 may be formed integrally with the main plate 200, and the rotary shaft 100 and the main plate 200 may be separately formed and assembled using welding or fastening means.

A plurality of vanes 300 may be formed on the other surface of the main plate 200. That is, the rotating shaft 100 may be formed on one surface of the main plate 200, and the feathers 300 may be formed on the opposite surface. At this time, the vanes 300 are formed on the inner circumference of the main plate 200, and may be disposed apart from each other along the circumferential direction of the main plate 200. As the main plate 200 is rotated, the fluid flows in the direction of the rotary shaft 100 and flows into the central portion of the vanes 300, so that the fluid is discharged outwardly through the vanes 300 and pressure is generated.

Here, the feathers 300 may be formed as full-shaped feathers. That is, as shown in the drawing, the vagina 300 is formed by inclining toward the forward direction (leftward) of the main plate 200 in the rotational direction of the main plate 200 with respect to the center line L passing through the center of the main plate 200, And may be formed as an entire curve (a shape bent in a counterclockwise direction) in the form of a curve in the same direction as the rotation direction. More specifically, the collar 300 is formed in a curved shape bent from the inner end portion A to the outer end portion B and is inclined to the left outward with respect to the center line L, In the counterclockwise direction, which is the same direction as the rotation direction of the rotor. And the outer edge B of the feather is determined by setting a sticking angle? With respect to the tangent L3 from the inner edge A to the inner diameter Di of the feather, and the sticking angle? To 90 [deg.]. That is, the inner end A of the vest 300 may be the front end and the outer end B may be the trailing edge.

Thus, the fixed-pressure centrifugal impeller of the present invention thus formed can have the same performance and efficiency as the graph of FIG. 4 and, as shown in the figure, the wind pressure and the air volume can be obtained higher than the turbo blower and the multi- Can be relatively high. That is, it can have both the advantages of a turbo blower and a blower.

Accordingly, the fixed-pressure centrifugal impeller of the present invention has an advantage in that the air volume and wind pressure are increased as compared with the conventional impellers, and the performance is excellent. However, in the case of the multi-blade blower, the impeller may be broken due to the occurrence of surging in the low air volume region. However, the impeller of the present invention is not prevented from surging due to low surge, The durability of the impeller can be improved. In addition, due to the characteristics of the performance, the impeller can be directly connected to the driving motor so that the structure of the power transmission device can be simplified, the structure of the impeller is strong, the number of vanes is small, Therefore, there is an advantage that cost and time required for manufacturing the blower can be saved.

[Example 2]

The collar 300 also forms a vertical bisector L2 of a straight line L1 connecting the inner end A and the outer end B and forms a circular arc L2 on the vertical bisector L2, Shaped curve that connects the inner end portion A and the outer end portion B with respect to the center point (point C) of the feather by selecting a center point (point C) of the feather determining the feather.

That is, the vane 300 may be formed of an arc-shaped curve and forms a straight line L 1 connecting the inner end A and the outer end B of the vowel 300, (L2) can be formed. And a point C, which is a center point of the feather determining the arc of the feather 300 on the vertical bisector L2, can be selected. Thus, a curved line 300 may be formed by forming an arc-shaped curve connecting the point A and the point B with the point C as a center. At this time, the radius R of the arc-shaped vane 300 may be the distance between the outer end B or the inner end A and the center point C of the feather.

The radius R of the vanes 300 becomes smaller as the position of the center point C of the vanes 300 approaches the straight line L1 and as the distance from the straight line L1 increases, The radius R of the blade 300 is increased and the length of the arc of the blade 300 can be adjusted according to the radius R. [

3, the radius R of the collar 300 becomes smaller and the length of the arc of the collar 300 becomes longer and becomes relatively convex. On the other hand, when the point C moves away from the L1, The radius R of the blade 300 is increased and the length of the arc of the blade 300 is shortened to be relatively flat.

In addition, the vest 300 has a tangent to the vest 300 at the inner end portion A and a tangent to the inner end portion A (A) according to the size of the attachment angle? The size of the entrance pupil 1 which is the angle formed by the tangent L3 with respect to the inner diameter Di is adjusted in accordance with the position of the center point C of the collar, The size of the exit pupil? 2, which is the angle formed by the tangent to the collar 300 at the end B and the tangent L4 relative to the outer diameter Do at the outer end B, can be adjusted.

That is, the inlet feather angle beta 1 of the vane 300 can be defined as an angle formed by the tangent line L3 with respect to the inner diameter Di at the inner end A of the vane 300, The size of the entrance pupil? 1 can be adjusted according to the size and position of the center point (point C) of the collar. At this time, as shown in the figure, the entrance pupil? 1 becomes smaller when the attachment angle? Becomes larger, and the size of the entrance pupil? 1 becomes smaller as the radius of curvature R becomes smaller as the point C approaches the L1. On the contrary, when the adherence angle? Is small, the entrance pupil? 1 becomes large, and when the radius of the C point is away from the L1 side and the radius R becomes large, the size of the entrance pupil? 1 becomes large. The outlet frictional angle? 2 of the vane 300 also has a tangent to the collar 300 at the outer end B of the vest 300 and a tangent L4 to the outer diameter Do at the outer end B, Can be defined as the angle formed between the two. At this time, as shown in the drawing, the exit pupil? 2 becomes smaller as the attachment angle? Becomes larger, and the exit pupil? 2 becomes larger as the point C becomes closer to L1 and the radius R becomes smaller. On the contrary, the exit pupil? 2 becomes larger as the attachment angle? Becomes smaller, and the exit pupil? 2 becomes smaller as the radius R becomes larger as the point C is further away from the L1 side.

In addition, the main plate 200 includes an inner diameter main plate 210 to which an inner end A of the vane 300 is connected; An outer diameter main plate 220 to which an outer end portion B of the vane 300 is connected; . ≪ / RTI >

That is, the main plate 200 is formed of a circular flat plate, and the inner circumferential main plate 210 having a circular cross-section may protrude from the central portion of the outer circumferential main plate 220 formed of a circular flat plate. The inner end A of the vane 300 is connected to the inner circumferential main plate 210 and the outer end B of the vane 300 is connected to the outer circumferential surface of the inner circumferential main plate 210. The inner circumferential main plate 210 and the outer circumferential main plate 220 may be formed in a & And may be formed to be connected to the main plate 220.

In addition to the above-mentioned cross-sectional shape, the main plate 200 may have various shapes such as a trapezoidal shape in cross section or a trapezoidal shape in which both sides are concave, and the inner circumferential main plate 210 and the outer circumferential main plate 220 may be integrally formed or separately formed They may be assembled and joined together. The vanes 300 may be integrally formed with the main plate 200 or may be integrally formed by welding the vanes 300 to the main plate 200. The vagaries 300 may be integrally formed by assembling the respective vanes 300 to the main plate 200 You may.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

1000: Fixed-pressure centrifugal impeller
100:
200: abacus
210: inner diameter abacus plate 220: outer diameter abacus plate
300: feathers
A: Inner end of the feather B: Outer end of the feather
C: Center point of the feather
L: center line
R: Radius of feather
β1: entrance pinch β2: exit pinch
Di: Diameter (inner diameter) of the circle connecting the inner ends A of the feathers.
Do: The diameter of the circle connecting the outer ends B of the feathers (outer diameter)
L1: A straight line connecting point A and point B of feather
L2: Vertical bisector of line L1
L3: Tangent to inner diameter (Di) at point A
L4: Tangent to outer diameter Di at point B
θ: Angle of attachment

Claims (5)

A main plate 200 rotated about the rotation axis 100; And
A plurality of feathers 300 formed inside the circumference of the main plate 200 and spaced apart in the circumferential direction; , ≪ / RTI >
The collar (300)
Is formed in a curved shape in the same direction as the rotation direction of the main plate 200 and is inclined toward the rotation direction of the main plate 200 on the basis of the center line L passing through the center of the main plate 200, The outer edge B of the feather is determined by setting a sticking angle? With respect to the tangential line L3 with the inner diameter Di at the inner end A of the felt, Deg.] In the axial direction.
The method according to claim 1,
The collar (300)
And a vertical bisector L2 of a straight line L1 connecting the inner end A and the outer end B is formed and the center point C of the feather determining the arc of the feather 300 on the vertical bisector L2 Shaped curve connecting the inner end portion (A) and the outer end portion (B) around the center point (C point) of the collar.
3. The method of claim 2,
The collar (300)
The radius R of the vane 300 decreases as the position of the center point of the vane (point C) approaches the straight line L1 and the radius R of the vane 300 increases as the distance from the straight line L1 increases. And the length of the arc of the vane (300) is adjusted according to the radius (R).
3. The method of claim 2,
The collar (300)
The tangential line from the inner end A to the vest 300 and the inner diameter Di from the inner end A are determined according to the magnitude of the attachment angle θ and the center point of the feather The size of the entrance pupil? 1, which is the angle formed by the tangent L3,
A tangent to the collar 300 at the outer end B and a tangent to the outer diameter Do at the outer end B depends on the magnitude of the attachment angle θ and the position of the center point C of the feather And the size of the impeller outlet angle (? 2) formed by the impeller (L4) is adjusted.
The method according to claim 1,
The main plate (200)
An inner circumferential main plate 210 to which an inner end A of the collar 300 is connected; And
An outer diameter main plate 220 to which an outer end portion B of the vane 300 is connected;
Wherein the impeller includes a plurality of impellers.

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